A154281 1,0,0,1 followed by 0,0,0...

1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset: 1

Author

Mats Granvik, Jan 06 2009

Keywords

• nonn
• mult

Comments

Dirichlet inverse of this sequence is A154282.

Crossrefs

Cf. A154272, A154271, A154269.

Programs

Mathematica

PadRight[{1,0,0,1},120,0] (* Harvey P. Dale, Aug 06 2012 *)

PARI

a(n)={n==1 || n==4} \\ Andrew Howroyd, Aug 05 2018

Formula

Multiplicative with a(2^2) = 1, a(2^e) = 0 for e<>2, a(p^e) = 0 for odd prime p. - Andrew Howroyd, Aug 05 2018